Reformat use declarations.

The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.

compiler/rustc_resolve/src/rustdoc.rs

@@ -1,3 +1,6 @@
+use std::mem;
+use std::ops::Range;
+
 use pulldown_cmark::{
     BrokenLink, BrokenLinkCallback, CowStr, Event, LinkType, Options, Parser, Tag,
 };
@@ -8,8 +11,6 @@ use rustc_middle::ty::TyCtxt;
 use rustc_span::def_id::DefId;
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::{InnerSpan, Span, DUMMY_SP};
-use std::mem;
-use std::ops::Range;
 use tracing::{debug, trace};
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]